linux/arch/x86/entry/vdso/vdso32
Gabriel Krisman Bertazi c5c878125a x86: vdso: Expose sigreturn address on vdso to the kernel
Syscall user redirection requires the signal trampoline code to not be
captured, in order to support returning with a locked selector while
avoiding recursion back into the signal handler.  For ia-32, which has
the trampoline in the vDSO, expose the entry points to the kernel, such
that it can avoid dispatching syscalls from that region to userspace.

Suggested-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20201127193238.821364-2-krisman@collabora.com
2020-12-02 10:32:16 +01:00
..
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
note.S x86/xen: remove 32-bit Xen PV guest support 2020-08-11 08:26:48 +02:00
sigreturn.S x86: vdso: Expose sigreturn address on vdso to the kernel 2020-12-02 10:32:16 +01:00
system_call.S x86/asm: Use SYM_INNER_LABEL instead of GLOBAL 2019-10-18 11:27:44 +02:00
vclock_gettime.c x86/paravirt: Remove 32-bit support from CONFIG_PARAVIRT_XXL 2020-08-15 13:52:11 +02:00
vdso32.lds.S x86/vdso: Add clock_gettime64() entry point 2019-06-22 21:21:10 +02:00